Failed to import coupon CSV

I follow the guide and I failed to import coupon csv. Right after upload csv and press upload, there is blank page with word “merge coupon” and nothing below. I look into console I see there is an error of

Uncaught TypeError: jQuery(…).chosen is not a function
at HTMLDocument.<anonymous> (admin.js?ver=1.1.3:16)
at i (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:2)
at Object.fireWith [as resolveWith] (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:2)
at Function.ready (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:2)
at HTMLDocument.J (load-scripts.php?c=0&load[]=jquery-core,jquery-migrate,utils,jquery-ui-core,jquery-ui-widget,jquery-ui-mouse,jquery-ui-sortable&ver=5.2.2:2)

We tried importing coupons in our test environment and were able to import the coupons successfully. The issue you are facing might be due to some site-specific issue. Could you please reach us via support.